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C.EARWATER C R O U P, I ISI C 2 13 Recovery Well Installation and Development The recovery well was constructed with clean, flush threaded, schedule 40 polyvinyl chloride (PVC), 4-inch diameter well materials Well screen, with 0 020-inch slotting, was extended from 10 to 30 feet below grade Blank PVC was coupled to the screen and extended to the surface The filter pack consists of clean #3 Lonestar Sand installed from 9 to 30 feet below grade, and was sealed with a 3-foot thick layer of hydrated bentonite The remaining annular space was filled with neat cement The well was capped with a locking expansion plug, and a tamper resistant well-box was set with concrete over the wellhead Well construction detail is included in Appendix A Recovery well RW-1 was developed on May 19, 1995 by a combination of surging and bailing Following surging, water was removed from the well using a clean bailer until the water was relatively free of sediment, and pH, temperature, and ' conductivity of the water had stabilized 2 14 Sparge Well Installation The sparge wells were constructed with clean, flush threaded, schedule 40 (PVC), 2- inch diameter well materials Well screen, with 0 020-inch slotting, was extended from approximately 23 to 25 feet below grade Blank PVC was coupled to the screen and extended to the surface The filter pack consists of clean #3 Lonestar Sand installed from 22 to 25 feet below grade, and was sealed with a 3-foot thick layer of hydrated bentonite The remaining annular space was filled with neat cement The well was capped with a locking expansion plug, and a tamper resistant well-box was set with concrete over the wellhead Well construction details are included in IAppendix A 2.2 Groundwater Sampling (4th Quarter 1995 and 1st Quarter 1996) 2 2 1 Groundwater Gauging and Sampling Methods On October 19, 1995, and January 5, 1996, Clearwater gauged the depth to water in all monitoring and recovery wells A water sample was also collected from the domestic well on January 5, 1996. The thickness of SPH in well MW-1 was also measured Well MW-1 was not sampled due to presence of SPH The remaining wells were purged of approximately three saturated casing volumes prior to sampling During purging, groundwater was monitored for stabilization of temperature, conductivity, and pH All wells were then sampled once water levels had recovered to approximately 80% of the pre-purge water level Well gauging and purging field data is presented as Appendix C Groundwater samples were collected from the monitoring wells using polyethylene bailers The samples were given the same designation as the well from which they were collected Samples were labeled, documented on a chain-of- D-107 PAR /RAP CRAP 4 February 21, 1996